Aziraphale
Aziraphale doesn't know Doc, but he came at Wynonna's invitation. He'll introduce himself to Doc as Wynonna's friend. He didn't bring a gift, but watched to see what others brought so he had an idea what Doc might like... and then used an angelic miracle to manifest a pair of spiffy cowboy boots, all wrapped up neatly in a box with a bow.
He gravitates toward the food, and gushes over the 'Authentic American Cuisine'.
He'll be chatting up Jo and meeting Dean while there.
Line dancing fascinates him - it reminds him some ye olde folk dancing he saw in the long past. The steps are simple enough, and if somebody coaxes him, he'll actually give it a shot.